Remote Antenna Compensation

1. A remote antenna system comprising: an antenna controller circuit; and a remote antenna circuit coupled to the antenna controller circuit by a cable; the remote antenna system comprising: a bidirectional data signal path for carrying transmit and received data signals between the antenna controller circuit and the remote antenna circuit; and a control path for carrying control information between the antenna controller circuit and the remote antenna circuit; wherein the control path is a bidirectional control path comprising: a transmit circuit comprising an input to receive control information and configured to convert the control information into a series of pulses; and a receive circuit comprising: a comparator circuit configure to receive the series of pulses and reconstruct them to the control signal.

2. The remote antenna system of claim 1 , wherein the transmit circuit comprises a high pass filter configured to receive a control information signal and convert a transition of the control information signal to a pulse.

3. The remote antenna system of claim 2 , wherein the control information signal comprises a square wave and a transition of the control information signal comprises one of a high to low transition and a low to high transition.

4. The remote antenna system of claim 2 , wherein the high pass filter comprises a resistor and capacitor coupled in series between a control information signal input and cable circuitry.

5. The remote antenna system of claim 1 , wherein the control path is configured to operate in a first direction from the remote antenna controller circuit to the remote antenna circuit and the control information carried in the first direction comprises a transmit state signal indicating whether the remote antenna is to transmit the data signal or receive the data signal.

6. The remote antenna system of claim 5 , wherein the comparator circuit is configured to receive a series of pulses from the remote antenna controller and reconstruct the series of pulses to a transmit state signal.

7. The remote antenna system of claim 6 , further comprising a microcontroller configured to measure a power at the first amplifier and generate a measured power signal to be carried by the control path in the first direction.

8. The remote antenna system of claim 7 , wherein the microcontroller is further configured to generate a hold signal to be coupled to the comparator, the hold signal overrides the output of the comparator circuit such that it corresponds to the hold signal.

9. The remote antenna system of claim 8 , wherein the microcontroller is configured to generate the hold signal to set the comparator circuit output to a transmit state of the antenna being transmitting in response to generating a measured power signal.

10. The remote antenna system of claim 1 , wherein the control path is configured to operate in a second direction from the remote antenna circuit to the remote antenna controller circuit and the control information carried in the second direction comprises a measured power signal corresponding to a transmit power of the remote antenna.

11. The remote antenna system of claim 1 , wherein the comparator circuit comprises an output for outputting the reconstructed signal.

12. The remote antenna system of claim 1 , wherein the remote antenna circuitry further comprises a compensation circuit configured to amplify the data signal to compensate for cable loss of the cable.

13. The remote antenna system of claim 12 , wherein the compensation circuit comprises a first amplifier to amplify a transmit data signal and a second amplifier to amplify a receive data signal and first and second switches to switch between the first and second amplifiers in response to the transmit state signal.

14. A remote antenna circuit configured to be coupled to an antenna controller by a cable; the remote antenna circuit comprising: a bidirectional data signal path for carrying transmit and received data signals between the antenna controller circuit and the remote antenna circuit; and a control path for carrying control information between the antenna controller circuit and the remote antenna circuit; wherein the control path is a bidirectional control path comprising: a transmit circuit comprising an input to receive control information and configured to convert the control information into a series of pulses; and a receive circuit comprising: a comparator circuit configure to receive the series of pulses and reconstruct them to the control signal.

15. A remote antenna controller configured to be coupled to a remote antenna circuit by a cable; the remote antenna controller comprising: a bidirectional data signal path for carrying transmit and received data signals between the antenna controller and the remote antenna circuit; and a control path for carrying control information between the remote antenna controller and the remote antenna circuit; wherein the control path is a bidirectional control path comprising: a transmit circuit comprising an input to receive control information and configured to convert the control information into a series of pulses; and a receive circuit comprising: a comparator circuit configure to receive the series of pulses and reconstruct them to the control signal.